code: def setUpClass(cls):
      cls.root_dir = cls.get_base_temp_dir()
      dataset_dir = os.path.join(
          cls.root_dir, "fluent_speech_commands_dataset"
      )
      (
          cls.mocked_train_samples,
          cls.mocked_valid_samples,
          cls.mocked_test_samples,
      ) = get_mock_dataset(dataset_dir)
  
file_path: audio/test/torchaudio_unittest/datasets/fluentcommands_test.py
imports: import csv
  import os
  import random
  import string
  from torchaudio.datasets import fluentcommands
  from torchaudio_unittest.common_utils import get_whitenoise, save_wav, TempDirMixin, TorchaudioTestCase
label_desc: Use image node_id 1 for calling the TestFluentSpeechCommands obj's underlying member method code with example usage: obj.setUpClass(cls) without return types